;;; ob-sass.el --- Babel Functions for the Sass CSS generation language -*- lexical-binding: t; -*-
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;; Copyright (C) 2009-2018 Free Software Foundation, Inc.
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;; Author: Eric Schulte
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;; Keywords: literate programming, reproducible research
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;; Homepage: https://orgmode.org
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; For more information on sass see http://sass-lang.com/
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;;
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;; This accepts a 'file' header argument which is the target of the
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;; compiled sass. The default output type for sass evaluation is
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;; either file (if a 'file' header argument was given) or scalar if no
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;; such header argument was supplied.
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;;
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;; A 'cmdline' header argument can be supplied to pass arguments to
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;; the sass command line.
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;;; Requirements:
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;; - sass-mode :: http://github.com/nex3/haml/blob/master/extra/sass-mode.el
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;;; Code:
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(require 'ob)
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(defvar org-babel-default-header-args:sass '())
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(defun org-babel-execute:sass (body params)
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"Execute a block of Sass code with Babel.
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This function is called by `org-babel-execute-src-block'."
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(let* ((file (cdr (assq :file params)))
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(out-file (or file (org-babel-temp-file "sass-out-")))
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(cmdline (cdr (assq :cmdline params)))
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(in-file (org-babel-temp-file "sass-in-"))
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(cmd (concat "sass " (or cmdline "")
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" " (org-babel-process-file-name in-file)
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" " (org-babel-process-file-name out-file))))
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(with-temp-file in-file
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(insert (org-babel-expand-body:generic body params)))
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(org-babel-eval cmd "")
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(if file
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nil ;; signal that output has already been written to file
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(with-temp-buffer (insert-file-contents out-file) (buffer-string)))))
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(defun org-babel-prep-session:sass (_session _params)
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"Raise an error because sass does not support sessions."
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(error "Sass does not support sessions"))
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(provide 'ob-sass)
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;;; ob-sass.el ends here
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